We hope that this Anthology will be useful to you, motivating your continuous improvement and enriching your capabilities. Through it, we seek to bring you closer to the pathologies of white blood cells and platelets. Although it is considered a difficult field to assimilate for some in its beginnings, it is an indispensable branch in the diagnostic complementation of the users of health services. Hence the importance of this text in which you will be able to familiarize yourself in a simple and concrete way with the terminology and the specialized language that it requires. We also suggest, if necessary, to ask for advice from trained personnel, so that any doubts on the subject can be solved.